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<div id=Content><div class="CClass"><div class=CTopic id=MainTopic><h1 class=CTitle><a name="OpenLayers.Renderer"></a>OpenLayers.<wbr>Renderer</h1><div class=CBody><p>This is the base class for all renderers.</p><p>This is based on a merger code written by Paul Spencer and Bertil Chapuis.&nbsp; It is largely composed of virtual functions that are to be implemented in technology-specific subclasses, but there is some generic code too.</p><p>The functions that <b>are</b> implemented here merely deal with the maintenance of the size and extent variables, as well as the cached &lsquo;resolution&rsquo; value.</p><p>A note to the user that all subclasses should use getResolution() instead of directly accessing this.resolution in order to correctly use the cacheing system.</p><!--START_ND_SUMMARY--><div class=Summary><div class=STitle>Summary</div><div class=SBorder><table border=0 cellspacing=0 cellpadding=0 class=STable><tr class="SMain"><td class=SEntry><a href="#OpenLayers.Renderer" >OpenLayers.<wbr>Renderer</a></td><td class=SDescription>This is the base class for all renderers.</td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Renderer.Properties" >Properties</a></td><td class=SDescription></td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.container" >container</a></td><td class=SDescription>{DOMElement}</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.root" >root</a></td><td class=SDescription>{DOMElement}</td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.extent" >extent</a></td><td class=SDescription>{<a href="BaseTypes/Bounds-js.html#OpenLayers.Bounds" class=LClass id=link1 onMouseOver="ShowTip(event, 'tt1', 'link1')" onMouseOut="HideTip('tt1')">OpenLayers.Bounds</a>}</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.locked" >locked</a></td><td class=SDescription>{Boolean} If the renderer is currently in a state where many things are changing, the &lsquo;locked&rsquo; property is set to true. </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.size" >size</a></td><td class=SDescription>{<a href="BaseTypes/Size-js.html#OpenLayers.Size" class=LClass id=link2 onMouseOver="ShowTip(event, 'tt2', 'link2')" onMouseOut="HideTip('tt2')">OpenLayers.Size</a>}</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.resolution" >resolution</a></td><td class=SDescription>{Float} cache of current map resolution</td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.map" >map</a></td><td class=SDescription>{<a href="Map-js.html#OpenLayers.Map" class=LClass id=link3 onMouseOver="ShowTip(event, 'tt3', 'link3')" onMouseOut="HideTip('tt3')">OpenLayers.Map</a>} Reference to the map -- this is set in Vector&rsquo;s setMap()</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.featureDx" >featureDx</a></td><td class=SDescription>{Number} Feature offset in x direction. </td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Renderer.Constructor" >Constructor</a></td><td class=SDescription></td></tr><tr class="SConstructor SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.OpenLayers.Renderer" >OpenLayers.<wbr>Renderer</a></td><td class=SDescription></td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Renderer.Functions" >Functions</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.destroy" id=link4 onMouseOver="ShowTip(event, 'tt4', 'link4')" onMouseOut="HideTip('tt4')">destroy</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.supported" id=link5 onMouseOver="ShowTip(event, 'tt5', 'link5')" onMouseOut="HideTip('tt5')">supported</a></td><td class=SDescription>This should be overridden by specific subclasses</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.setExtent" id=link6 onMouseOver="ShowTip(event, 'tt6', 'link6')" onMouseOut="HideTip('tt6')">setExtent</a></td><td class=SDescription>Set the visible part of the layer.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.setSize" id=link7 onMouseOver="ShowTip(event, 'tt7', 'link7')" onMouseOut="HideTip('tt7')">setSize</a></td><td class=SDescription>Sets the size of the drawing surface.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.getResolution" id=link8 onMouseOver="ShowTip(event, 'tt8', 'link8')" onMouseOut="HideTip('tt8')">getResolution</a></td><td class=SDescription>Uses cached copy of resolution if available to minimize computing</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.drawFeature" id=link9 onMouseOver="ShowTip(event, 'tt9', 'link9')" onMouseOut="HideTip('tt9')">drawFeature</a></td><td class=SDescription>Draw the feature. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.calculateFeatureDx" id=link10 onMouseOver="ShowTip(event, 'tt10', 'link10')" onMouseOut="HideTip('tt10')">calculateFeatureDx</a></td><td class=SDescription>{Number} Calculates the feature offset in x direction. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.drawGeometry" id=link11 onMouseOver="ShowTip(event, 'tt11', 'link11')" onMouseOut="HideTip('tt11')">drawGeometry</a></td><td class=SDescription>Draw a geometry. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.drawText" id=link12 onMouseOver="ShowTip(event, 'tt12', 'link12')" onMouseOut="HideTip('tt12')">drawText</a></td><td class=SDescription>Function for drawing text labels. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.removeText" id=link13 onMouseOver="ShowTip(event, 'tt13', 'link13')" onMouseOut="HideTip('tt13')">removeText</a></td><td class=SDescription>Function for removing text labels. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.clear" id=link14 onMouseOver="ShowTip(event, 'tt14', 'link14')" onMouseOut="HideTip('tt14')">clear</a></td><td class=SDescription>Clear all vectors from the renderer. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.getFeatureIdFromEvent" id=link15 onMouseOver="ShowTip(event, 'tt15', 'link15')" onMouseOut="HideTip('tt15')">getFeatureIdFromEvent</a></td><td class=SDescription>Returns a feature id from an event on the renderer. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.eraseFeatures" id=link16 onMouseOver="ShowTip(event, 'tt16', 'link16')" onMouseOut="HideTip('tt16')">eraseFeatures</a></td><td class=SDescription>This is called by the layer to erase features</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.eraseGeometry" id=link17 onMouseOver="ShowTip(event, 'tt17', 'link17')" onMouseOut="HideTip('tt17')">eraseGeometry</a></td><td class=SDescription>Remove a geometry from the renderer (by id). </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.moveRoot" id=link18 onMouseOver="ShowTip(event, 'tt18', 'link18')" onMouseOut="HideTip('tt18')">moveRoot</a></td><td class=SDescription>moves this renderer&rsquo;s root to a (different) renderer. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.getRenderLayerId" id=link19 onMouseOver="ShowTip(event, 'tt19', 'link19')" onMouseOut="HideTip('tt19')">getRenderLayerId</a></td><td class=SDescription>Gets the layer that this renderer&rsquo;s output appears on. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.applyDefaultSymbolizer" id=link20 onMouseOver="ShowTip(event, 'tt20', 'link20')" onMouseOut="HideTip('tt20')">applyDefaultSymbolizer</a></td><td class=SDescription></td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Renderer.Constants" >Constants</a></td><td class=SDescription></td></tr><tr class="SConstant SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Renderer.OpenLayers.Renderer.defaultSymbolizer" >OpenLayers.<wbr>Renderer.<wbr>defaultSymbolizer</a></td><td class=SDescription>{Object} Properties from this symbolizer will be applied to symbolizers with missing properties. </td></tr><tr class="SConstant SIndent2"><td class=SEntry><a href="#OpenLayers.Renderer.OpenLayers.Renderer.symbol" >OpenLayers.<wbr>Renderer.<wbr>symbol</a></td><td class=SDescription>Coordinate arrays for well known (named) symbols.</td></tr></table></div></div><!--END_ND_SUMMARY--></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Properties"></a>Properties</h3></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.container"></a>container</h3><div class=CBody><p>{DOMElement}</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.root"></a>root</h3><div class=CBody><p>{DOMElement}</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.extent"></a>extent</h3><div class=CBody><p>{<a href="BaseTypes/Bounds-js.html#OpenLayers.Bounds" class=LClass id=link21 onMouseOver="ShowTip(event, 'tt1', 'link21')" onMouseOut="HideTip('tt1')">OpenLayers.Bounds</a>}</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.locked"></a>locked</h3><div class=CBody><p>{Boolean} If the renderer is currently in a state where many things are changing, the &lsquo;locked&rsquo; property is set to true.&nbsp; This means that renderers can expect at least one more drawFeature event to be called with the &lsquo;locked&rsquo; property set to &lsquo;true&rsquo;: In some renderers, this might make sense to use as a &lsquo;only update local information&rsquo; flag.</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.size"></a>size</h3><div class=CBody><p>{<a href="BaseTypes/Size-js.html#OpenLayers.Size" class=LClass id=link22 onMouseOver="ShowTip(event, 'tt2', 'link22')" onMouseOut="HideTip('tt2')">OpenLayers.Size</a>}</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.resolution"></a>resolution</h3><div class=CBody><p>{Float} cache of current map resolution</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.map"></a>map</h3><div class=CBody><p>{<a href="Map-js.html#OpenLayers.Map" class=LClass id=link23 onMouseOver="ShowTip(event, 'tt3', 'link23')" onMouseOut="HideTip('tt3')">OpenLayers.Map</a>} Reference to the map -- this is set in Vector&rsquo;s setMap()</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.featureDx"></a>featureDx</h3><div class=CBody><p>{Number} Feature offset in x direction.&nbsp; Will be calculated for and applied to the current feature while rendering (see <a href="#OpenLayers.Renderer.calculateFeatureDx" class=LFunction id=link24 onMouseOver="ShowTip(event, 'tt10', 'link24')" onMouseOut="HideTip('tt10')">calculateFeatureDx</a>).</p></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Constructor"></a>Constructor</h3></div></div>

<div class="CConstructor"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.OpenLayers.Renderer"></a>OpenLayers.<wbr>Renderer</h3><div class=CBody><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>containerID</td><td class=CDLDescription>{<a href="BaseTypes-js.html#OpenLayers.String" class=LClass id=link25 onMouseOver="ShowTip(event, 'tt21', 'link25')" onMouseOut="HideTip('tt21')">String</a>}</td></tr><tr><td class=CDLEntry>options</td><td class=CDLDescription>{Object} options for this renderer.&nbsp; See sublcasses for supported options.</td></tr></table></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Functions"></a>Functions</h3></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.destroy"></a>destroy</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">destroy: function()</td></tr></table></blockquote></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.supported"></a>supported</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">supported: function()</td></tr></table></blockquote><p>This should be overridden by specific subclasses</p><h4 class=CHeading>Returns</h4><p>{Boolean} Whether or not the browser supports the renderer class</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.setExtent"></a>setExtent</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>setExtent: function(</td><td class="PParameter  prettyprint " nowrap>extent,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>resolutionChanged</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Set the visible part of the layer.</p><p>Resolution has probably changed, so we nullify the resolution cache (this.resolution) -- this way it will be re-computed when next it is needed.&nbsp; We nullify the resolution cache (this.resolution) if resolutionChanged is set to true - this way it will be re-computed on the next getResolution() request.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>extent</td><td class=CDLDescription>{<a href="BaseTypes/Bounds-js.html#OpenLayers.Bounds" class=LClass id=link26 onMouseOver="ShowTip(event, 'tt1', 'link26')" onMouseOut="HideTip('tt1')">OpenLayers.Bounds</a>}</td></tr><tr><td class=CDLEntry>resolutionChanged</td><td class=CDLDescription>{Boolean}</td></tr></table><h4 class=CHeading>Returns</h4><p>{Boolean} true to notify the layer that the new extent does not exceed the coordinate range, and the features will not need to be redrawn.&nbsp; False otherwise.</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.setSize"></a>setSize</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>setSize: function(</td><td class="PParameter  prettyprint " nowrap>size</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Sets the size of the drawing surface.</p><p>Resolution has probably changed, so we nullify the resolution cache (this.resolution) -- this way it will be re-computed when next it is needed.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>size</td><td class=CDLDescription>{<a href="BaseTypes/Size-js.html#OpenLayers.Size" class=LClass id=link27 onMouseOver="ShowTip(event, 'tt2', 'link27')" onMouseOut="HideTip('tt2')">OpenLayers.Size</a>}</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.getResolution"></a>getResolution</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">getResolution: function()</td></tr></table></blockquote><p>Uses cached copy of resolution if available to minimize computing</p><h4 class=CHeading>Returns</h4><p>{Float} The current map&rsquo;s resolution</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.drawFeature"></a>drawFeature</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>drawFeature: function(</td><td class="PParameter  prettyprint " nowrap>feature,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Draw the feature.&nbsp;  The optional style argument can be used to override the feature&rsquo;s own style.&nbsp;  This method should only be called from layer.drawFeature().</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>feature</td><td class=CDLDescription>{<a href="Feature/Vector-js.html#OpenLayers.Feature.Vector" class=LClass id=link28 onMouseOver="ShowTip(event, 'tt22', 'link28')" onMouseOut="HideTip('tt22')">OpenLayers.Feature.Vector</a>}</td></tr><tr><td class=CDLEntry>style</td><td class=CDLDescription>{&lt;Object&gt;}</td></tr></table><h4 class=CHeading>Returns</h4><p>{Boolean} true if the feature has been drawn completely, false if not, undefined if the feature had no geometry</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.calculateFeatureDx"></a>calculateFeatureDx</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>calculateFeatureDx: function(</td><td class="PParameter  prettyprint " nowrap>bounds,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>worldBounds</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>{Number} Calculates the feature offset in x direction.&nbsp; Looking at the center of the feature bounds and the renderer extent, we calculate how many world widths the two are away from each other.&nbsp; This distance is used to shift the feature as close as possible to the center of the current enderer extent, which ensures that the feature is visible in the current viewport.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>bounds</td><td class=CDLDescription>{<a href="BaseTypes/Bounds-js.html#OpenLayers.Bounds" class=LClass id=link29 onMouseOver="ShowTip(event, 'tt1', 'link29')" onMouseOut="HideTip('tt1')">OpenLayers.Bounds</a>} Bounds of the feature</td></tr><tr><td class=CDLEntry>worldBounds</td><td class=CDLDescription>{<a href="BaseTypes/Bounds-js.html#OpenLayers.Bounds" class=LClass id=link30 onMouseOver="ShowTip(event, 'tt1', 'link30')" onMouseOut="HideTip('tt1')">OpenLayers.Bounds</a>} Bounds of the world</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.drawGeometry"></a>drawGeometry</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>drawGeometry: function(</td><td class="PParameter  prettyprint " nowrap>geometry,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>featureId</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Draw a geometry.&nbsp;  This should only be called from the renderer itself.&nbsp; Use layer.drawFeature() from outside the renderer. virtual function</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>geometry</td><td class=CDLDescription>{<a href="Geometry-js.html#OpenLayers.Geometry" class=LClass id=link31 onMouseOver="ShowTip(event, 'tt23', 'link31')" onMouseOut="HideTip('tt23')">OpenLayers.Geometry</a>}</td></tr><tr><td class=CDLEntry>style</td><td class=CDLDescription>{Object}</td></tr><tr><td class=CDLEntry>featureId</td><td class=CDLDescription>{<a href="BaseTypes-js.html#OpenLayers.String" class=LClass id=link32 onMouseOver="ShowTip(event, 'tt21', 'link32')" onMouseOut="HideTip('tt21')">String</a>}</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.drawText"></a>drawText</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>drawText: function(</td><td class="PParameter  prettyprint " nowrap>featureId,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>location</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Function for drawing text labels.&nbsp; This method is only called by the renderer itself.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>featureId</td><td class=CDLDescription>{String} style -</td></tr><tr><td class=CDLEntry>location</td><td class=CDLDescription>{<a href="Geometry/Point-js.html#OpenLayers.Geometry.Point" class=LClass id=link33 onMouseOver="ShowTip(event, 'tt24', 'link33')" onMouseOut="HideTip('tt24')">OpenLayers.Geometry.Point</a>}</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.removeText"></a>removeText</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>removeText: function(</td><td class="PParameter  prettyprint " nowrap>featureId</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Function for removing text labels.&nbsp; This method is only called by the renderer itself.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>featureId</td><td class=CDLDescription>{String}</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.clear"></a>clear</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">clear: function()</td></tr></table></blockquote><p>Clear all vectors from the renderer. virtual function.</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.getFeatureIdFromEvent"></a>getFeatureIdFromEvent</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>getFeatureIdFromEvent: function(</td><td class="PParameter  prettyprint " nowrap>evt</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Returns a feature id from an event on the renderer.&nbsp; How this happens is specific to the renderer.&nbsp;  This should be called from layer.getFeatureFromEvent().&nbsp; Virtual function.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>evt</td><td class=CDLDescription>{<a href="Events-js.html#OpenLayers.Event" class=LClass id=link34 onMouseOver="ShowTip(event, 'tt25', 'link34')" onMouseOut="HideTip('tt25')">OpenLayers.Event</a>}</td></tr></table><h4 class=CHeading>Returns</h4><p>{String} A feature id or undefined.</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.eraseFeatures"></a>eraseFeatures</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>eraseFeatures: function(</td><td class="PParameter  prettyprint " nowrap>features</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>This is called by the layer to erase features</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>features</td><td class=CDLDescription>{Array(<a href="Feature/Vector-js.html#OpenLayers.Feature.Vector" class=LClass id=link35 onMouseOver="ShowTip(event, 'tt22', 'link35')" onMouseOut="HideTip('tt22')">OpenLayers.Feature.Vector</a>)}</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.eraseGeometry"></a>eraseGeometry</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>eraseGeometry: function(</td><td class="PParameter  prettyprint " nowrap>geometry,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>featureId</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Remove a geometry from the renderer (by id). virtual function.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>geometry</td><td class=CDLDescription>{<a href="Geometry-js.html#OpenLayers.Geometry" class=LClass id=link36 onMouseOver="ShowTip(event, 'tt23', 'link36')" onMouseOut="HideTip('tt23')">OpenLayers.Geometry</a>}</td></tr><tr><td class=CDLEntry>featureId</td><td class=CDLDescription>{String}</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.moveRoot"></a>moveRoot</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>moveRoot: function(</td><td class="PParameter  prettyprint " nowrap>renderer</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>moves this renderer&rsquo;s root to a (different) renderer.&nbsp; To be implemented by subclasses that require a common renderer root for feature selection.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>renderer</td><td class=CDLDescription>{<a href="#OpenLayers.Renderer.OpenLayers.Renderer" class=LConstructor >OpenLayers.Renderer</a>} target renderer for the moved root</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.getRenderLayerId"></a>getRenderLayerId</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">getRenderLayerId: function()</td></tr></table></blockquote><p>Gets the layer that this renderer&rsquo;s output appears on.&nbsp; If moveRoot was used, this will be different from the id of the layer containing the features rendered by this renderer.</p><h4 class=CHeading>Returns</h4><p>{String} the id of the output layer.</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.applyDefaultSymbolizer"></a>applyDefaultSymbolizer</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>applyDefaultSymbolizer: function(</td><td class="PParameter  prettyprint " nowrap>symbolizer</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>symbolizer</td><td class=CDLDescription>{Object}</td></tr></table><h4 class=CHeading>Returns</h4><p>{Object}</p></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.Constants"></a>Constants</h3></div></div>

<div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.OpenLayers.Renderer.defaultSymbolizer"></a>OpenLayers.<wbr>Renderer.<wbr>defaultSymbolizer</h3><div class=CBody><p>{Object} Properties from this symbolizer will be applied to symbolizers with missing properties.&nbsp; This can also be used to set a global symbolizer default in OpenLayers.&nbsp; To be SLD 1.x compliant, add the following code before rendering any vector features:</p><blockquote><pre class="prettyprint">OpenLayers.Renderer.defaultSymbolizer = {
    fillColor: &quot;#808080&quot;,
    fillOpacity: 1,
    strokeColor: &quot;#000000&quot;,
    strokeOpacity: 1,
    strokeWidth: 1,
    pointRadius: 3,
    graphicName: &quot;square&quot;
};</pre></blockquote></div></div></div>

<div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Renderer.OpenLayers.Renderer.symbol"></a>OpenLayers.<wbr>Renderer.<wbr>symbol</h3><div class=CBody><p>Coordinate arrays for well known (named) symbols.</p></div></div></div>

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<!--START_ND_TOOLTIPS-->
<div class=CToolTip id="tt1"><div class=CClass>Instances of this class represent bounding boxes. </div></div><div class=CToolTip id="tt2"><div class=CClass>Instances of this class represent a width/height pair</div></div><div class=CToolTip id="tt3"><div class=CClass>Instances of OpenLayers.Map are interactive maps embedded in a web page. </div></div><div class=CToolTip id="tt4"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">destroy: function()</td></tr></table></blockquote></div></div><div class=CToolTip id="tt5"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">supported: function()</td></tr></table></blockquote>This should be overridden by specific subclasses</div></div><div class=CToolTip id="tt6"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>setExtent: function(</td><td class="PParameter  prettyprint " nowrap>extent,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>resolutionChanged</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Set the visible part of the layer.</div></div><div class=CToolTip id="tt7"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>setSize: function(</td><td class="PParameter  prettyprint " nowrap>size</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Sets the size of the drawing surface.</div></div><div class=CToolTip id="tt8"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">getResolution: function()</td></tr></table></blockquote>Uses cached copy of resolution if available to minimize computing</div></div><div class=CToolTip id="tt9"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>drawFeature: function(</td><td class="PParameter  prettyprint " nowrap>feature,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Draw the feature. </div></div><div class=CToolTip id="tt10"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>calculateFeatureDx: function(</td><td class="PParameter  prettyprint " nowrap>bounds,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>worldBounds</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>{Number} Calculates the feature offset in x direction. </div></div><div class=CToolTip id="tt11"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>drawGeometry: function(</td><td class="PParameter  prettyprint " nowrap>geometry,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>featureId</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Draw a geometry. </div></div><div class=CToolTip id="tt12"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>drawText: function(</td><td class="PParameter  prettyprint " nowrap>featureId,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>style,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>location</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Function for drawing text labels. </div></div><div class=CToolTip id="tt13"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>removeText: function(</td><td class="PParameter  prettyprint " nowrap>featureId</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Function for removing text labels. </div></div><div class=CToolTip id="tt14"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">clear: function()</td></tr></table></blockquote>Clear all vectors from the renderer. </div></div><div class=CToolTip id="tt15"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>getFeatureIdFromEvent: function(</td><td class="PParameter  prettyprint " nowrap>evt</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Returns a feature id from an event on the renderer. </div></div><div class=CToolTip id="tt16"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>eraseFeatures: function(</td><td class="PParameter  prettyprint " nowrap>features</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>This is called by the layer to erase features</div></div><div class=CToolTip id="tt17"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>eraseGeometry: function(</td><td class="PParameter  prettyprint " nowrap>geometry,</td></tr><tr><td></td><td class="PParameter  prettyprint " nowrap>featureId</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Remove a geometry from the renderer (by id). </div></div><div class=CToolTip id="tt18"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>moveRoot: function(</td><td class="PParameter  prettyprint " nowrap>renderer</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>moves this renderer&rsquo;s root to a (different) renderer. </div></div><div class=CToolTip id="tt19"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">getRenderLayerId: function()</td></tr></table></blockquote>Gets the layer that this renderer&rsquo;s output appears on. </div></div><div class=CToolTip id="tt20"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>applyDefaultSymbolizer: function(</td><td class="PParameter  prettyprint " nowrap>symbolizer</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote></div></div><div class=CToolTip id="tt21"><div class=CClass>Contains convenience functions for string manipulation.</div></div><div class=CToolTip id="tt22"><div class=CClass>Vector features use the OpenLayers.Geometry classes as geometry description. </div></div><div class=CToolTip id="tt23"><div class=CClass>A Geometry is a description of a geographic object. </div></div><div class=CToolTip id="tt24"><div class=CClass>Point geometry class.</div></div><div class=CToolTip id="tt25"><div class=CClass>Utility functions for event handling.</div></div><!--END_ND_TOOLTIPS-->




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